summaryrefslogtreecommitdiffstats
path: root/drivers/net/wireless/libertas/if_sdio.c
blob: 09fcfad742e755e74a2e15d56a2b2d938f4775ae (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
630
631
632
633
634
635
636
637
638
639
640
641
642
643
644
645
646
647
648
649
650
651
652
653
654
655
656
657
658
659
660
661
662
663
664
665
666
667
668
669
670
671
672
673
674
675
676
677
678
679
680
681
682
683
684
685
686
687
688
689
690
691
692
693
694
695
696
697
698
699
700
701
702
703
704
705
706
707
708
709
710
711
712
713
714
715
716
717
718
719
720
721
722
723
724
725
726
727
728
729
730
731
732
733
734
735
736
737
738
739
740
741
742
743
744
745
746
747
748
749
750
751
752
753
754
755
756
757
758
759
760
761
762
763
764
765
766
767
768
769
770
771
772
773
774
775
776
777
778
779
780
781
782
783
784
785
786
787
788
789
790
791
792
793
794
795
796
797
798
799
800
801
802
803
804
805
806
807
808
809
810
811
812
813
814
815
816
817
818
819
820
821
822
823
824
825
826
827
828
829
830
831
832
833
834
835
836
837
838
839
840
841
842
843
844
845
846
847
848
849
850
851
852
853
854
855
856
857
858
859
860
861
862
863
864
865
866
867
868
869
870
871
872
873
874
875
876
877
878
879
880
881
882
883
884
885
886
887
888
889
890
891
892
893
894
895
896
897
898
899
900
901
902
903
904
905
906
907
908
909
910
911
912
913
914
915
916
917
918
919
920
921
922
923
924
925
926
927
928
929
930
931
932
933
934
935
936
937
938
939
940
941
942
943
944
945
946
947
948
949
950
951
952
953
954
955
956
957
958
959
960
961
962
963
964
965
966
967
968
969
970
971
972
973
974
975
976
977
978
979
980
981
982
983
984
985
986
987
988
989
990
991
992
993
994
995
996
997
998
999
1000
1001
1002
1003
1004
1005
1006
1007
1008
1009
1010
1011
1012
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023
1024
1025
1026
1027
1028
1029
1030
1031
1032
1033
1034
1035
1036
1037
1038
1039
1040
1041
1042
1043
1044
1045
1046
1047
1048
1049
1050
1051
1052
1053
1054
1055
1056
1057
1058
1059
1060
1061
1062
1063
1064
1065
1066
1067
1068
1069
1070
1071
1072
1073
1074
1075
1076
1077
1078
1079
1080
1081
1082
1083
1084
1085
1086
1087
1088
1089
1090
1091
1092
1093
1094
1095
1096
1097
1098
1099
1100
1101
1102
1103
1104
1105
1106
1107
1108
1109
1110
1111
1112
1113
1114
1115
1116
1117
1118
1119
1120
1121
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132
1133
1134
1135
1136
1137
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149
1150
1151
1152
1153
1154
1155
1156
1157
1158
1159
1160
1161
1162
1163
1164
1165
1166
1167
1168
1169
1170
1171
1172
1173
1174
1175
1176
1177
1178
1179
1180
1181
1182
1183
1184
1185
1186
1187
1188
1189
1190
1191
1192
1193
1194
1195
1196
1197
1198
1199
1200
1201
1202
1203
1204
1205
1206
1207
1208
1209
1210
1211
1212
1213
1214
1215
1216
1217
1218
1219
1220
1221
1222
1223
1224
1225
1226
1227
1228
1229
1230
/*
 *  linux/drivers/net/wireless/libertas/if_sdio.c
 *
 *  Copyright 2007-2008 Pierre Ossman
 *
 * Inspired by if_cs.c, Copyright 2007 Holger Schurig
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or (at
 * your option) any later version.
 *
 * This hardware has more or less no CMD53 support, so all registers
 * must be accessed using sdio_readb()/sdio_writeb().
 *
 * Transfers must be in one transaction or the firmware goes bonkers.
 * This means that the transfer must either be small enough to do a
 * byte based transfer or it must be padded to a multiple of the
 * current block size.
 *
 * As SDIO is still new to the kernel, it is unfortunately common with
 * bugs in the host controllers related to that. One such bug is that
 * controllers cannot do transfers that aren't a multiple of 4 bytes.
 * If you don't have time to fix the host controller driver, you can
 * work around the problem by modifying if_sdio_host_to_card() and
 * if_sdio_card_to_host() to pad the data.
 */

#include <linux/kernel.h>
#include <linux/moduleparam.h>
#include <linux/firmware.h>
#include <linux/netdevice.h>
#include <linux/delay.h>
#include <linux/mmc/card.h>
#include <linux/mmc/sdio_func.h>
#include <linux/mmc/sdio_ids.h>

#include "host.h"
#include "decl.h"
#include "defs.h"
#include "dev.h"
#include "cmd.h"
#include "if_sdio.h"

/* The if_sdio_remove() callback function is called when
 * user removes this module from kernel space or ejects
 * the card from the slot. The driver handles these 2 cases
 * differently for SD8688 combo chip.
 * If the user is removing the module, the FUNC_SHUTDOWN
 * command for SD8688 is sent to the firmware.
 * If the card is removed, there is no need to send this command.
 *
 * The variable 'user_rmmod' is used to distinguish these two
 * scenarios. This flag is initialized as FALSE in case the card
 * is removed, and will be set to TRUE for module removal when
 * module_exit function is called.
 */
static u8 user_rmmod;

static char *lbs_helper_name = NULL;
module_param_named(helper_name, lbs_helper_name, charp, 0644);

static char *lbs_fw_name = NULL;
module_param_named(fw_name, lbs_fw_name, charp, 0644);

static const struct sdio_device_id if_sdio_ids[] = {
	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
			SDIO_DEVICE_ID_MARVELL_LIBERTAS) },
	{ SDIO_DEVICE(SDIO_VENDOR_ID_MARVELL,
			SDIO_DEVICE_ID_MARVELL_8688WLAN) },
	{ /* end: all zeroes */				},
};

MODULE_DEVICE_TABLE(sdio, if_sdio_ids);

struct if_sdio_model {
	int model;
	const char *helper;
	const char *firmware;
};

static struct if_sdio_model if_sdio_models[] = {
	{
		/* 8385 */
		.model = IF_SDIO_MODEL_8385,
		.helper = "sd8385_helper.bin",
		.firmware = "sd8385.bin",
	},
	{
		/* 8686 */
		.model = IF_SDIO_MODEL_8686,
		.helper = "sd8686_helper.bin",
		.firmware = "sd8686.bin",
	},
	{
		/* 8688 */
		.model = IF_SDIO_MODEL_8688,
		.helper = "sd8688_helper.bin",
		.firmware = "sd8688.bin",
	},
};
MODULE_FIRMWARE("sd8385_helper.bin");
MODULE_FIRMWARE("sd8385.bin");
MODULE_FIRMWARE("sd8686_helper.bin");
MODULE_FIRMWARE("sd8686.bin");
MODULE_FIRMWARE("sd8688_helper.bin");
MODULE_FIRMWARE("sd8688.bin");

struct if_sdio_packet {
	struct if_sdio_packet	*next;
	u16			nb;
	u8			buffer[0] __attribute__((aligned(4)));
};

struct if_sdio_card {
	struct sdio_func	*func;
	struct lbs_private	*priv;

	int			model;
	unsigned long		ioport;
	unsigned int		scratch_reg;

	const char		*helper;
	const char		*firmware;

	u8			buffer[65536];

	spinlock_t		lock;
	struct if_sdio_packet	*packets;

	struct workqueue_struct	*workqueue;
	struct work_struct	packet_worker;

	u8			rx_unit;
};

/********************************************************************/
/* I/O                                                              */
/********************************************************************/

/*
 *  For SD8385/SD8686, this function reads firmware status after
 *  the image is downloaded, or reads RX packet length when
 *  interrupt (with IF_SDIO_H_INT_UPLD bit set) is received.
 *  For SD8688, this function reads firmware status only.
 */
static u16 if_sdio_read_scratch(struct if_sdio_card *card, int *err)
{
	int ret;
	u16 scratch;

	scratch = sdio_readb(card->func, card->scratch_reg, &ret);
	if (!ret)
		scratch |= sdio_readb(card->func, card->scratch_reg + 1,
					&ret) << 8;

	if (err)
		*err = ret;

	if (ret)
		return 0xffff;

	return scratch;
}

static u8 if_sdio_read_rx_unit(struct if_sdio_card *card)
{
	int ret;
	u8 rx_unit;

	rx_unit = sdio_readb(card->func, IF_SDIO_RX_UNIT, &ret);

	if (ret)
		rx_unit = 0;

	return rx_unit;
}

static u16 if_sdio_read_rx_len(struct if_sdio_card *card, int *err)
{
	int ret;
	u16 rx_len;

	switch (card->model) {
	case IF_SDIO_MODEL_8385:
	case IF_SDIO_MODEL_8686:
		rx_len = if_sdio_read_scratch(card, &ret);
		break;
	case IF_SDIO_MODEL_8688:
	default: /* for newer chipsets */
		rx_len = sdio_readb(card->func, IF_SDIO_RX_LEN, &ret);
		if (!ret)
			rx_len <<= card->rx_unit;
		else
			rx_len = 0xffff;	/* invalid length */

		break;
	}

	if (err)
		*err = ret;

	return rx_len;
}

static int if_sdio_handle_cmd(struct if_sdio_card *card,
		u8 *buffer, unsigned size)
{
	struct lbs_private *priv = card->priv;
	int ret;
	unsigned long flags;
	u8 i;

	lbs_deb_enter(LBS_DEB_SDIO);

	if (size > LBS_CMD_BUFFER_SIZE) {
		lbs_deb_sdio("response packet too large (%d bytes)\n",
			(int)size);
		ret = -E2BIG;
		goto out;
	}

	spin_lock_irqsave(&priv->driver_lock, flags);

	i = (priv->resp_idx == 0) ? 1 : 0;
	BUG_ON(priv->resp_len[i]);
	priv->resp_len[i] = size;
	memcpy(priv->resp_buf[i], buffer, size);
	lbs_notify_command_response(priv, i);

	spin_unlock_irqrestore(&card->priv->driver_lock, flags);

	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
	return ret;
}

static int if_sdio_handle_data(struct if_sdio_card *card,
		u8 *buffer, unsigned size)
{
	int ret;
	struct sk_buff *skb;
	char *data;

	lbs_deb_enter(LBS_DEB_SDIO);

	if (size > MRVDRV_ETH_RX_PACKET_BUFFER_SIZE) {
		lbs_deb_sdio("response packet too large (%d bytes)\n",
			(int)size);
		ret = -E2BIG;
		goto out;
	}

	skb = dev_alloc_skb(MRVDRV_ETH_RX_PACKET_BUFFER_SIZE + NET_IP_ALIGN);
	if (!skb) {
		ret = -ENOMEM;
		goto out;
	}

	skb_reserve(skb, NET_IP_ALIGN);

	data = skb_put(skb, size);

	memcpy(data, buffer, size);

	lbs_process_rxed_packet(card->priv, skb);

	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static int if_sdio_handle_event(struct if_sdio_card *card,
		u8 *buffer, unsigned size)
{
	int ret;
	u32 event;

	lbs_deb_enter(LBS_DEB_SDIO);

	if (card->model == IF_SDIO_MODEL_8385) {
		event = sdio_readb(card->func, IF_SDIO_EVENT, &ret);
		if (ret)
			goto out;

		/* right shift 3 bits to get the event id */
		event >>= 3;
	} else {
		if (size < 4) {
			lbs_deb_sdio("event packet too small (%d bytes)\n",
				(int)size);
			ret = -EINVAL;
			goto out;
		}
		event = buffer[3] << 24;
		event |= buffer[2] << 16;
		event |= buffer[1] << 8;
		event |= buffer[0] << 0;
	}

	lbs_queue_event(card->priv, event & 0xFF);
	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static int if_sdio_card_to_host(struct if_sdio_card *card)
{
	int ret;
	u8 status;
	u16 size, type, chunk;
	unsigned long timeout;

	lbs_deb_enter(LBS_DEB_SDIO);

	size = if_sdio_read_rx_len(card, &ret);
	if (ret)
		goto out;

	if (size < 4) {
		lbs_deb_sdio("invalid packet size (%d bytes) from firmware\n",
			(int)size);
		ret = -EINVAL;
		goto out;
	}

	timeout = jiffies + HZ;
	while (1) {
		status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
		if (ret)
			goto out;
		if (status & IF_SDIO_IO_RDY)
			break;
		if (time_after(jiffies, timeout)) {
			ret = -ETIMEDOUT;
			goto out;
		}
		mdelay(1);
	}

	/*
	 * The transfer must be in one transaction or the firmware
	 * goes suicidal. There's no way to guarantee that for all
	 * controllers, but we can at least try.
	 */
	chunk = sdio_align_size(card->func, size);

	ret = sdio_readsb(card->func, card->buffer, card->ioport, chunk);
	if (ret)
		goto out;

	chunk = card->buffer[0] | (card->buffer[1] << 8);
	type = card->buffer[2] | (card->buffer[3] << 8);

	lbs_deb_sdio("packet of type %d and size %d bytes\n",
		(int)type, (int)chunk);

	if (chunk > size) {
		lbs_deb_sdio("packet fragment (%d > %d)\n",
			(int)chunk, (int)size);
		ret = -EINVAL;
		goto out;
	}

	if (chunk < size) {
		lbs_deb_sdio("packet fragment (%d < %d)\n",
			(int)chunk, (int)size);
	}

	switch (type) {
	case MVMS_CMD:
		ret = if_sdio_handle_cmd(card, card->buffer + 4, chunk - 4);
		if (ret)
			goto out;
		break;
	case MVMS_DAT:
		ret = if_sdio_handle_data(card, card->buffer + 4, chunk - 4);
		if (ret)
			goto out;
		break;
	case MVMS_EVENT:
		ret = if_sdio_handle_event(card, card->buffer + 4, chunk - 4);
		if (ret)
			goto out;
		break;
	default:
		lbs_deb_sdio("invalid type (%d) from firmware\n",
				(int)type);
		ret = -EINVAL;
		goto out;
	}

out:
	if (ret)
		lbs_pr_err("problem fetching packet from firmware\n");

	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static void if_sdio_host_to_card_worker(struct work_struct *work)
{
	struct if_sdio_card *card;
	struct if_sdio_packet *packet;
	unsigned long timeout;
	u8 status;
	int ret;
	unsigned long flags;

	lbs_deb_enter(LBS_DEB_SDIO);

	card = container_of(work, struct if_sdio_card, packet_worker);

	while (1) {
		spin_lock_irqsave(&card->lock, flags);
		packet = card->packets;
		if (packet)
			card->packets = packet->next;
		spin_unlock_irqrestore(&card->lock, flags);

		if (!packet)
			break;

		sdio_claim_host(card->func);

		timeout = jiffies + HZ;
		while (1) {
			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
			if (ret)
				goto release;
			if (status & IF_SDIO_IO_RDY)
				break;
			if (time_after(jiffies, timeout)) {
				ret = -ETIMEDOUT;
				goto release;
			}
			mdelay(1);
		}

		ret = sdio_writesb(card->func, card->ioport,
				packet->buffer, packet->nb);
		if (ret)
			goto release;
release:
		sdio_release_host(card->func);

		kfree(packet);
	}

	lbs_deb_leave(LBS_DEB_SDIO);
}

/********************************************************************/
/* Firmware                                                         */
/********************************************************************/

static int if_sdio_prog_helper(struct if_sdio_card *card)
{
	int ret;
	u8 status;
	const struct firmware *fw;
	unsigned long timeout;
	u8 *chunk_buffer;
	u32 chunk_size;
	const u8 *firmware;
	size_t size;

	lbs_deb_enter(LBS_DEB_SDIO);

	ret = request_firmware(&fw, card->helper, &card->func->dev);
	if (ret) {
		lbs_pr_err("can't load helper firmware\n");
		goto out;
	}

	chunk_buffer = kzalloc(64, GFP_KERNEL);
	if (!chunk_buffer) {
		ret = -ENOMEM;
		goto release_fw;
	}

	sdio_claim_host(card->func);

	ret = sdio_set_block_size(card->func, 32);
	if (ret)
		goto release;

	firmware = fw->data;
	size = fw->size;

	while (size) {
		timeout = jiffies + HZ;
		while (1) {
			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
			if (ret)
				goto release;
			if ((status & IF_SDIO_IO_RDY) &&
					(status & IF_SDIO_DL_RDY))
				break;
			if (time_after(jiffies, timeout)) {
				ret = -ETIMEDOUT;
				goto release;
			}
			mdelay(1);
		}

		chunk_size = min(size, (size_t)60);

		*((__le32*)chunk_buffer) = cpu_to_le32(chunk_size);
		memcpy(chunk_buffer + 4, firmware, chunk_size);
/*
		lbs_deb_sdio("sending %d bytes chunk\n", chunk_size);
*/
		ret = sdio_writesb(card->func, card->ioport,
				chunk_buffer, 64);
		if (ret)
			goto release;

		firmware += chunk_size;
		size -= chunk_size;
	}

	/* an empty block marks the end of the transfer */
	memset(chunk_buffer, 0, 4);
	ret = sdio_writesb(card->func, card->ioport, chunk_buffer, 64);
	if (ret)
		goto release;

	lbs_deb_sdio("waiting for helper to boot...\n");

	/* wait for the helper to boot by looking at the size register */
	timeout = jiffies + HZ;
	while (1) {
		u16 req_size;

		req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
		if (ret)
			goto release;

		req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
		if (ret)
			goto release;

		if (req_size != 0)
			break;

		if (time_after(jiffies, timeout)) {
			ret = -ETIMEDOUT;
			goto release;
		}

		msleep(10);
	}

	ret = 0;

release:
	sdio_release_host(card->func);
	kfree(chunk_buffer);
release_fw:
	release_firmware(fw);

out:
	if (ret)
		lbs_pr_err("failed to load helper firmware\n");

	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static int if_sdio_prog_real(struct if_sdio_card *card)
{
	int ret;
	u8 status;
	const struct firmware *fw;
	unsigned long timeout;
	u8 *chunk_buffer;
	u32 chunk_size;
	const u8 *firmware;
	size_t size, req_size;

	lbs_deb_enter(LBS_DEB_SDIO);

	ret = request_firmware(&fw, card->firmware, &card->func->dev);
	if (ret) {
		lbs_pr_err("can't load firmware\n");
		goto out;
	}

	chunk_buffer = kzalloc(512, GFP_KERNEL);
	if (!chunk_buffer) {
		ret = -ENOMEM;
		goto release_fw;
	}

	sdio_claim_host(card->func);

	ret = sdio_set_block_size(card->func, 32);
	if (ret)
		goto release;

	firmware = fw->data;
	size = fw->size;

	while (size) {
		timeout = jiffies + HZ;
		while (1) {
			status = sdio_readb(card->func, IF_SDIO_STATUS, &ret);
			if (ret)
				goto release;
			if ((status & IF_SDIO_IO_RDY) &&
					(status & IF_SDIO_DL_RDY))
				break;
			if (time_after(jiffies, timeout)) {
				ret = -ETIMEDOUT;
				goto release;
			}
			mdelay(1);
		}

		req_size = sdio_readb(card->func, IF_SDIO_RD_BASE, &ret);
		if (ret)
			goto release;

		req_size |= sdio_readb(card->func, IF_SDIO_RD_BASE + 1, &ret) << 8;
		if (ret)
			goto release;
/*
		lbs_deb_sdio("firmware wants %d bytes\n", (int)req_size);
*/
		if (req_size == 0) {
			lbs_deb_sdio("firmware helper gave up early\n");
			ret = -EIO;
			goto release;
		}

		if (req_size & 0x01) {
			lbs_deb_sdio("firmware helper signalled error\n");
			ret = -EIO;
			goto release;
		}

		if (req_size > size)
			req_size = size;

		while (req_size) {
			chunk_size = min(req_size, (size_t)512);

			memcpy(chunk_buffer, firmware, chunk_size);
/*
			lbs_deb_sdio("sending %d bytes (%d bytes) chunk\n",
				chunk_size, (chunk_size + 31) / 32 * 32);
*/
			ret = sdio_writesb(card->func, card->ioport,
				chunk_buffer, roundup(chunk_size, 32));
			if (ret)
				goto release;

			firmware += chunk_size;
			size -= chunk_size;
			req_size -= chunk_size;
		}
	}

	ret = 0;

	lbs_deb_sdio("waiting for firmware to boot...\n");

	/* wait for the firmware to boot */
	timeout = jiffies + HZ;
	while (1) {
		u16 scratch;

		scratch = if_sdio_read_scratch(card, &ret);
		if (ret)
			goto release;

		if (scratch == IF_SDIO_FIRMWARE_OK)
			break;

		if (time_after(jiffies, timeout)) {
			ret = -ETIMEDOUT;
			goto release;
		}

		msleep(10);
	}

	ret = 0;

release:
	sdio_release_host(card->func);
	kfree(chunk_buffer);
release_fw:
	release_firmware(fw);

out:
	if (ret)
		lbs_pr_err("failed to load firmware\n");

	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static int if_sdio_prog_firmware(struct if_sdio_card *card)
{
	int ret;
	u16 scratch;

	lbs_deb_enter(LBS_DEB_SDIO);

	sdio_claim_host(card->func);
	scratch = if_sdio_read_scratch(card, &ret);
	sdio_release_host(card->func);

	if (ret)
		goto out;

	lbs_deb_sdio("firmware status = %#x\n", scratch);

	if (scratch == IF_SDIO_FIRMWARE_OK) {
		lbs_deb_sdio("firmware already loaded\n");
		goto success;
	}

	ret = if_sdio_prog_helper(card);
	if (ret)
		goto out;

	ret = if_sdio_prog_real(card);
	if (ret)
		goto out;

success:
	sdio_claim_host(card->func);
	sdio_set_block_size(card->func, IF_SDIO_BLOCK_SIZE);
	sdio_release_host(card->func);
	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

/*******************************************************************/
/* Libertas callbacks                                              */
/*******************************************************************/

static int if_sdio_host_to_card(struct lbs_private *priv,
		u8 type, u8 *buf, u16 nb)
{
	int ret;
	struct if_sdio_card *card;
	struct if_sdio_packet *packet, *cur;
	u16 size;
	unsigned long flags;

	lbs_deb_enter_args(LBS_DEB_SDIO, "type %d, bytes %d", type, nb);

	card = priv->card;

	if (nb > (65536 - sizeof(struct if_sdio_packet) - 4)) {
		ret = -EINVAL;
		goto out;
	}

	/*
	 * The transfer must be in one transaction or the firmware
	 * goes suicidal. There's no way to guarantee that for all
	 * controllers, but we can at least try.
	 */
	size = sdio_align_size(card->func, nb + 4);

	packet = kzalloc(sizeof(struct if_sdio_packet) + size,
			GFP_ATOMIC);
	if (!packet) {
		ret = -ENOMEM;
		goto out;
	}

	packet->next = NULL;
	packet->nb = size;

	/*
	 * SDIO specific header.
	 */
	packet->buffer[0] = (nb + 4) & 0xff;
	packet->buffer[1] = ((nb + 4) >> 8) & 0xff;
	packet->buffer[2] = type;
	packet->buffer[3] = 0;

	memcpy(packet->buffer + 4, buf, nb);

	spin_lock_irqsave(&card->lock, flags);

	if (!card->packets)
		card->packets = packet;
	else {
		cur = card->packets;
		while (cur->next)
			cur = cur->next;
		cur->next = packet;
	}

	switch (type) {
	case MVMS_CMD:
		priv->dnld_sent = DNLD_CMD_SENT;
		break;
	case MVMS_DAT:
		priv->dnld_sent = DNLD_DATA_SENT;
		break;
	default:
		lbs_deb_sdio("unknown packet type %d\n", (int)type);
	}

	spin_unlock_irqrestore(&card->lock, flags);

	queue_work(card->workqueue, &card->packet_worker);

	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static int if_sdio_enter_deep_sleep(struct lbs_private *priv)
{
	int ret = -1;
	struct cmd_header cmd;

	memset(&cmd, 0, sizeof(cmd));

	lbs_deb_sdio("send DEEP_SLEEP command\n");
	ret = __lbs_cmd(priv, CMD_802_11_DEEP_SLEEP, &cmd, sizeof(cmd),
			lbs_cmd_copyback, (unsigned long) &cmd);
	if (ret)
		lbs_pr_err("DEEP_SLEEP cmd failed\n");

	mdelay(200);
	return ret;
}

static int if_sdio_exit_deep_sleep(struct lbs_private *priv)
{
	struct if_sdio_card *card = priv->card;
	int ret = -1;

	lbs_deb_enter(LBS_DEB_SDIO);
	sdio_claim_host(card->func);

	sdio_writeb(card->func, HOST_POWER_UP, CONFIGURATION_REG, &ret);
	if (ret)
		lbs_pr_err("sdio_writeb failed!\n");

	sdio_release_host(card->func);
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
	return ret;
}

static int if_sdio_reset_deep_sleep_wakeup(struct lbs_private *priv)
{
	struct if_sdio_card *card = priv->card;
	int ret = -1;

	lbs_deb_enter(LBS_DEB_SDIO);
	sdio_claim_host(card->func);

	sdio_writeb(card->func, 0, CONFIGURATION_REG, &ret);
	if (ret)
		lbs_pr_err("sdio_writeb failed!\n");

	sdio_release_host(card->func);
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
	return ret;

}

/*******************************************************************/
/* SDIO callbacks                                                  */
/*******************************************************************/

static void if_sdio_interrupt(struct sdio_func *func)
{
	int ret;
	struct if_sdio_card *card;
	u8 cause;

	lbs_deb_enter(LBS_DEB_SDIO);

	card = sdio_get_drvdata(func);

	cause = sdio_readb(card->func, IF_SDIO_H_INT_STATUS, &ret);
	if (ret)
		goto out;

	lbs_deb_sdio("interrupt: 0x%X\n", (unsigned)cause);

	sdio_writeb(card->func, ~cause, IF_SDIO_H_INT_STATUS, &ret);
	if (ret)
		goto out;

	/*
	 * Ignore the define name, this really means the card has
	 * successfully received the command.
	 */
	card->priv->is_activity_detected = 1;
	if (cause & IF_SDIO_H_INT_DNLD)
		lbs_host_to_card_done(card->priv);


	if (cause & IF_SDIO_H_INT_UPLD) {
		ret = if_sdio_card_to_host(card);
		if (ret)
			goto out;
	}

	ret = 0;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);
}

static int if_sdio_probe(struct sdio_func *func,
		const struct sdio_device_id *id)
{
	struct if_sdio_card *card;
	struct lbs_private *priv;
	int ret, i;
	unsigned int model;
	struct if_sdio_packet *packet;

	lbs_deb_enter(LBS_DEB_SDIO);

	for (i = 0;i < func->card->num_info;i++) {
		if (sscanf(func->card->info[i],
				"802.11 SDIO ID: %x", &model) == 1)
			break;
		if (sscanf(func->card->info[i],
				"ID: %x", &model) == 1)
			break;
		if (!strcmp(func->card->info[i], "IBIS Wireless SDIO Card")) {
			model = IF_SDIO_MODEL_8385;
			break;
		}
	}

	if (i == func->card->num_info) {
		lbs_pr_err("unable to identify card model\n");
		return -ENODEV;
	}

	card = kzalloc(sizeof(struct if_sdio_card), GFP_KERNEL);
	if (!card)
		return -ENOMEM;

	card->func = func;
	card->model = model;

	switch (card->model) {
	case IF_SDIO_MODEL_8385:
		card->scratch_reg = IF_SDIO_SCRATCH_OLD;
		break;
	case IF_SDIO_MODEL_8686:
		card->scratch_reg = IF_SDIO_SCRATCH;
		break;
	case IF_SDIO_MODEL_8688:
	default: /* for newer chipsets */
		card->scratch_reg = IF_SDIO_FW_STATUS;
		break;
	}

	spin_lock_init(&card->lock);
	card->workqueue = create_workqueue("libertas_sdio");
	INIT_WORK(&card->packet_worker, if_sdio_host_to_card_worker);

	for (i = 0;i < ARRAY_SIZE(if_sdio_models);i++) {
		if (card->model == if_sdio_models[i].model)
			break;
	}

	if (i == ARRAY_SIZE(if_sdio_models)) {
		lbs_pr_err("unkown card model 0x%x\n", card->model);
		ret = -ENODEV;
		goto free;
	}

	card->helper = if_sdio_models[i].helper;
	card->firmware = if_sdio_models[i].firmware;

	if (lbs_helper_name) {
		lbs_deb_sdio("overriding helper firmware: %s\n",
			lbs_helper_name);
		card->helper = lbs_helper_name;
	}

	if (lbs_fw_name) {
		lbs_deb_sdio("overriding firmware: %s\n", lbs_fw_name);
		card->firmware = lbs_fw_name;
	}

	sdio_claim_host(func);

	ret = sdio_enable_func(func);
	if (ret)
		goto release;

	ret = sdio_claim_irq(func, if_sdio_interrupt);
	if (ret)
		goto disable;

	card->ioport = sdio_readb(func, IF_SDIO_IOPORT, &ret);
	if (ret)
		goto release_int;

	card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 1, &ret) << 8;
	if (ret)
		goto release_int;

	card->ioport |= sdio_readb(func, IF_SDIO_IOPORT + 2, &ret) << 16;
	if (ret)
		goto release_int;

	sdio_release_host(func);

	sdio_set_drvdata(func, card);

	lbs_deb_sdio("class = 0x%X, vendor = 0x%X, "
			"device = 0x%X, model = 0x%X, ioport = 0x%X\n",
			func->class, func->vendor, func->device,
			model, (unsigned)card->ioport);

	ret = if_sdio_prog_firmware(card);
	if (ret)
		goto reclaim;

	priv = lbs_add_card(card, &func->dev);
	if (!priv) {
		ret = -ENOMEM;
		goto reclaim;
	}

	card->priv = priv;

	priv->card = card;
	priv->hw_host_to_card = if_sdio_host_to_card;
	priv->enter_deep_sleep = if_sdio_enter_deep_sleep;
	priv->exit_deep_sleep = if_sdio_exit_deep_sleep;
	priv->reset_deep_sleep_wakeup = if_sdio_reset_deep_sleep_wakeup;

	priv->fw_ready = 1;

	sdio_claim_host(func);

	/*
	 * Get rx_unit if the chip is SD8688 or newer.
	 * SD8385 & SD8686 do not have rx_unit.
	 */
	if ((card->model != IF_SDIO_MODEL_8385)
			&& (card->model != IF_SDIO_MODEL_8686))
		card->rx_unit = if_sdio_read_rx_unit(card);
	else
		card->rx_unit = 0;

	/*
	 * Enable interrupts now that everything is set up
	 */
	sdio_writeb(func, 0x0f, IF_SDIO_H_INT_MASK, &ret);
	sdio_release_host(func);
	if (ret)
		goto reclaim;

	/*
	 * FUNC_INIT is required for SD8688 WLAN/BT multiple functions
	 */
	if (card->model == IF_SDIO_MODEL_8688) {
		struct cmd_header cmd;

		memset(&cmd, 0, sizeof(cmd));

		lbs_deb_sdio("send function INIT command\n");
		if (__lbs_cmd(priv, CMD_FUNC_INIT, &cmd, sizeof(cmd),
				lbs_cmd_copyback, (unsigned long) &cmd))
			lbs_pr_alert("CMD_FUNC_INIT cmd failed\n");
	}

	ret = lbs_start_card(priv);
	if (ret)
		goto err_activate_card;

out:
	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;

err_activate_card:
	flush_workqueue(card->workqueue);
	lbs_remove_card(priv);
reclaim:
	sdio_claim_host(func);
release_int:
	sdio_release_irq(func);
disable:
	sdio_disable_func(func);
release:
	sdio_release_host(func);
free:
	destroy_workqueue(card->workqueue);
	while (card->packets) {
		packet = card->packets;
		card->packets = card->packets->next;
		kfree(packet);
	}

	kfree(card);

	goto out;
}

static void if_sdio_remove(struct sdio_func *func)
{
	struct if_sdio_card *card;
	struct if_sdio_packet *packet;

	lbs_deb_enter(LBS_DEB_SDIO);

	card = sdio_get_drvdata(func);

	if (user_rmmod && (card->model == IF_SDIO_MODEL_8688)) {
		/*
		 * FUNC_SHUTDOWN is required for SD8688 WLAN/BT
		 * multiple functions
		 */
		struct cmd_header cmd;

		memset(&cmd, 0, sizeof(cmd));

		lbs_deb_sdio("send function SHUTDOWN command\n");
		if (__lbs_cmd(card->priv, CMD_FUNC_SHUTDOWN,
				&cmd, sizeof(cmd), lbs_cmd_copyback,
				(unsigned long) &cmd))
			lbs_pr_alert("CMD_FUNC_SHUTDOWN cmd failed\n");
	}


	lbs_deb_sdio("call remove card\n");
	lbs_stop_card(card->priv);
	lbs_remove_card(card->priv);
	card->priv->surpriseremoved = 1;

	flush_workqueue(card->workqueue);
	destroy_workqueue(card->workqueue);

	sdio_claim_host(func);
	sdio_release_irq(func);
	sdio_disable_func(func);
	sdio_release_host(func);

	while (card->packets) {
		packet = card->packets;
		card->packets = card->packets->next;
		kfree(packet);
	}

	kfree(card);

	lbs_deb_leave(LBS_DEB_SDIO);
}

static struct sdio_driver if_sdio_driver = {
	.name		= "libertas_sdio",
	.id_table	= if_sdio_ids,
	.probe		= if_sdio_probe,
	.remove		= if_sdio_remove,
};

/*******************************************************************/
/* Module functions                                                */
/*******************************************************************/

static int __init if_sdio_init_module(void)
{
	int ret = 0;

	lbs_deb_enter(LBS_DEB_SDIO);

	printk(KERN_INFO "libertas_sdio: Libertas SDIO driver\n");
	printk(KERN_INFO "libertas_sdio: Copyright Pierre Ossman\n");

	ret = sdio_register_driver(&if_sdio_driver);

	/* Clear the flag in case user removes the card. */
	user_rmmod = 0;

	lbs_deb_leave_args(LBS_DEB_SDIO, "ret %d", ret);

	return ret;
}

static void __exit if_sdio_exit_module(void)
{
	lbs_deb_enter(LBS_DEB_SDIO);

	/* Set the flag as user is removing this module. */
	user_rmmod = 1;

	sdio_unregister_driver(&if_sdio_driver);

	lbs_deb_leave(LBS_DEB_SDIO);
}

module_init(if_sdio_init_module);
module_exit(if_sdio_exit_module);

MODULE_DESCRIPTION("Libertas SDIO WLAN Driver");
MODULE_AUTHOR("Pierre Ossman");
MODULE_LICENSE("GPL");
OpenPOWER on IntegriCloud